Prevalence and Correction of Near Vision Impairment at Seven Sites in China, India, Nepal, Niger, South Africa, and the United States

American Journal of Ophthalmology, 04/27/2012He M et al.

By 50 years of age, the majority of people suffer from near vision impairment, most of which can be corrected optically. Over 90% of those in need of near refractive correction in rural settings do not have the necessary spectacles.